body {
  height: 100vh;
}
.target {
  width: 40px;
  height: 40px;
  background-color: yellowgreen;
  transform: translate(280px, 300px);
}
.flyBall {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: skyblue;
}